I have experienced the same thing in the same situation: the next episode in a series auto plays at a lower quality. I think it’s a bug in the Netflix app, as I’ve never seen it happen in any of the other streaming apps on my AppleTV. I have been able to “reset” the video quality by backing out of the episode to the show’s episode list and restarting the episode. When it starts playing again it’s the high-resolution version. Very annoying, but at least it’s not a full reboot.
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